Are there any other secret cars other than the scuffed Audi R18?

[NJ72]

The Multi-class race in the teaser trailer, is non-existent. It featured the Audi LMP leading some GT3 cars at the Nordschleife.

Not being funny, but with a few mates in a lobby you can easily make a multi-class race. The leaderboard won't show it split out, but you can easily work it out yourself.

There's nothing in the trailer that can't be done in the game from what I can see...